Thermometer.



F. E. AMTHOH.

l THERMOMETER.

APPLlcATioN FILED 05019, 1912.

1916595@ Patfnted Dec. 28, 1915.

i m- ;irri i rinsing limb @reins FRITZ E. AMTHOR, Ol1 BRGGKLYN. NEW YORK, ASSIGNOR T() THE SGHAEFFER & BUDENBERG MFG. CO.. OF BROOKLYN, NEW' A COEPORTN 0F NEVI' YORK THERMOMETER- Application filed December 19, 1912.

Lo all zr/Lom 2715 may concern:

lie it known that. Farra E. Airrnon, a subject of the Emperor ci? Gcrmanv, and a resident oi Brooklyn, county ot Kings, and State of New York.I have inventlial certain new and useful lnnnovcments in rlh'crmometers, ot which the followingr is a specification, reference being' had to the accompany ing drawings, forming a part thereof.

My invention relates to temperature measurine` apparatus and. particular-lv to such as embodies remote indicating or recording; means suitablyv connected to an actuating' element alice-ted hv temperature chances.

The object of my invention is to provide a simple and durable transmitting' clement tor use a a part of: a thermometer of the character above indicated, that shall he insulated from temperature changes and from fumes and Icases and :lullv protected against mechanical injury.

l will describe my invention in the followin.;- specification and point out the novel teatures thereof in the appended claim.

In the drawings-Figure l is an elevation of a. thermometer embodying; my invention with a part of its novel element broken away to more clearly' show its construction. Fig'. 2 is a perspective view on a larger scale of a. .section or' the connecting' or transmittinp,l element ol. Fig. l.

Lilie characters of reference indicate corresponding` parts in all the v(ife'nres.

Referring' to the drav\'ings,-the thermometer here shown comprises a heat responsive pressure element l0. evposed to the medium for which a temperature n'ieasurcment is desired, an indicating', recordingy or registering gano or meter element- 550 and an interposefl connecting` or trausmitting;- elcnient 3G.

he detailed construction and mounting of the pressure element. l0 and the ,Linge or meter element 2O form no part ol niv pres ent invention and maiY be determined entirelyliy the exigencies ol an)T particular case.

For example. the element l0 is shown 'to comprise a tubular hodv 1l containing` come suitable expansihle fluid such as mercury. alcohol or a gas and sluniortcd hv a wall socket or fastener 1Q. The meter element has a` pressure chamber within the part 2l and a responsive pointer. index or stvlus My invention. resides in the combination Flaco@ 28, 1l93l5 Serial No, 737,592.

with the other parts the thermometer of the connecting or transmittim,T element 30 which conmriscs a preferably flexible conducting wire or rod 3l having a very Small lonnitiulinal hole which may be described hij statine; that it is capillari7 dimensions.

The life. of the instrument and accurac)7 ot its registration depend verf,7 largelyV upon the structure ot', and protection which is aflorded the traz' nttingij element, conseuuentlv l, have covered the tube 3l. with a close jacket oit such n'iaterial or materials as are l L adapted to annul the eiiect of out side influences.

For example, the tulle hay be covered with an inner la ver ct rubber or like ini terial which cont-acts with surface? a spiral tape covering 34C of fabric treated with varnish..` oil or `rum placed overthis lai-fer, over which mayY he a tubular woven sleevel andl an outer liameproof coating' 36 which may lie formed. el. asbestos.

The cover-ingrY is dr"rmined and applied with a view to prerenting1 lgases such as are encountered near iii-ast furnaces, retrigerati ine' plantsI or the lilre, fumes or moisture, from penetrating the cover and chemicallyr attacking' the tube as .vell as to provide protection against physical injury.

The size the opening 'through the wire is preferably lint not necessarily minute, so that but an extrei'nel small amount of the fluid contained in the tha anonieter tube ll can enter the t-ransinin. .in elemenn 'thus minimizing;- the eitect of 'temperature changes upon the tnhe itself. l3nt the close 'protective cover insulates whatever Huid is in the tube from the ten'aperatnre oi the sul"- roundingl element.

The tact that the connecting or transmittint; element is iiexiole and when bent or twisted does not reduce the eticctivencss ot the covering'. is a feature which makes my invention particularly desirable. A loose protective sleeve or shell ot relatively large diameter sach as has heretofore been used has on the contrary the disadvantage o' permitting 'the transmitting' tube to approach or malte contact. with its inside walls at some points while it is widely separat .d

. A l. gases to enter the space around fluenced by temperature and .a raging ory metering element, vand comprising a flexible metal Wire having a coextensive longitudinal opening' of Very small diameter relative to thevdiameter of the wire, and a'closely adhering heat insulating covering composed of a rubber covering adjacent to the Wire, a

spiral tape covering of gum treated `fabric placed over the rubber, a tubular Woven momen sleeve over the tape and an outer coating of asbestos whereby the' outer surface of the wire is protected against chemical and physical injury and the formation of moisture adjacent to the surface of the Wire is precluded.

in Witness whereof, I have hereunto set my hand this 18 day of December in the year 1912. y

.FRTZ E. AMTHOR.

Witnesses F. GRAVES, G. R. QUIMBY. 

